Liberatore appeared in only six games and made one start as a freshman, while allowing twelve earned runs in 10 innings.[3] In 2007, as a sophomore, he appeared in 15 games with four starts and an 8.42 earned run average (ERA)[3] and as a junior he had an 8.68 ERA in 13 appearances (eight starts).[3] He participated in the Valley Baseball League over the summer between his junior and senior seasons and won the pitcher of the year honors while leading the league with a .170 batting average against.[4] In 2009, he was 2-0 with a perfect 0.00 ERA in three starts, with 21 strikeouts[3] when he left his last game with a season-ending elbow injury.[4] Liberatore underwent Tommy John surgery[5] and received a medical redshirt season.[4] In 2010, as a redshirt senior, he was 6-4 with a 5.30 ERA in 13 starts.[3]
Liberatore began the 2015 season with the Oklahoma City Dodgers of the Class AAA Pacific Coast League. The Dodgers called him up to the major leagues for the first time on April 17, 2015.[11] He made his debut by pitching the ninth inning against the Colorado Rockies that night, retiring all three batters he faced.[12] Liberatore pitched in 39 games for the Dodgers with a 2–2 record and 4.25 ERA.[13] He also pitched in 19 games for Oklahoma City, with a 3.74 ERA.[7]
On July 9, 2016, Liberatore set a Dodgers franchise record with his 24th consecutive scoreless appearance, breaking the mark previously set by John Candelaria in 1991.[14] In 2016, he appeared in 58 games with a 3.38 ERA.[13] He underwent left elbow debridement surgery after the season.[15]
Liberatore was again optioned to Oklahoma City to begin the 2017 season.[16] After pitching in six games in the minors, he was recalled to the Dodgers on April 23.[17] He was sidelined with a groin injury in May[18] and then came down with left forearm tightness shortly afterwards.[19] That injury wound up keeping him on the disabled list for the rest of the season.[20] He only pitched 31⁄3 innings over four games for the Dodgers in 2017, allowing one run on three hits.[13]
On May 4, 2018, against the San Diego Padres at Estadio de Béisbol Monterrey, Liberatore was one of four pitchers involved in a combined no-hitter as the Dodgers won 4–0, pitching the ninth inning to finish off the game.[21] The Dodgers designated him for assignment on August 31, 2018[22] and released him on September 5.[23] In 17 major league games in 2018, he allowed four earned runs in 13 innings for a 2.77 ERA.[13]
